Here we have ultrasonic or radar level transmitter which would be used under the environment where the max. humidity is 100%RH.

But if we follow the IEC 60068-30 Environmental testing- Test Db: Damp heat, cyclic (12h+12h cycle) to verify the level transmitter, the 100%RH is not required in any period of that test.

So here are 3 questions:
1) If the test specimen passes the IEC60068-30 test, does it mean the transmitter could fully functionally work under 100%RH condition?

2) Why the test condition can hardly reach 100%RH, and 100%RH is not a mandatory requirement in any environmental test standard?

3) Is there any other method to prove the transmitter could work under 100%RH environment?

 

It could be because no one can reasonably expect it to work @100% RH. Or, under condensing conditions, or underwater.

Many electronic specs say all bets are off under those conditions except for submersible gear.

Regards
cww

 

>It could be because no one can reasonably expect it to work
>@100% RH. Or, under condensing conditions, or underwater.
>
>Many electronic specs say all bets are off under those
>conditions except for submersible gear.

Thank you for reply. But in the specs of the Purchaser, it is prescribed that the transducer ambient humidity limit is "100% RH, Non-Condensing". How could the Supplier prove to meet this environmental condition?

Regards,
Wang Zhichao

 

That's fine, but, ensuring that a 100%RH atmosphere remains non-condensing is rather difficult as a minor temperature change will
cause condensation.

For that matter even measuring near 100%RH is quite difficult. So practical standards and methods don't go there so that the results are consistently repeatable. One would do well not to depend on operation at 100% RH for the same reasons. That the sensor works at the highest controllable RH level implies that it will work as long as it doesn't get wet. That doesn't mean that you should push the limits. And you can bet that unless you can ensure that the atmosphere never condenses, you will own any failures. It would be better to ask the vendor how to apply their product under those conditions. Maybe a radome or air purge or something will enhance reliability.

Regards
cww